Mr. Zixiao Lan Profile

Zixiao Lan

at Harbin Engineering Univ

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Proceedings Article | 25 October 2018 Paper

Coherent absorption in optical metamaterials

Qiusheng Yang, Bowen Li, Zixiao Lan, Yuxiang Li, Zheng Zhu, Jinhui Shi

Proceedings Volume 10824, 1082408 (2018) https://doi.org/10.1117/12.2502872

KEYWORDS: Absorption, Metamaterials, Optical metamaterials, Dielectrics, Beam controllers, Optical simulations, Electromagnetism, Modulation, Terahertz radiation, Lithium

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Here we will mainly investigate the coupling mechanism of bilayered optical metamaterials with a standing wave and the selective coherent perfect absorption in bilayered optical metamaterials by the two coherent beams. The metamaterials consist of bilayered asymmetrically split rings (ASR) with different twist angles 0° and 180°, spatially separated by a very thin dielectric substrate. Electric and magnetic dipolar excitations can be selectively enhanced or eliminated when the ASR is placed at the antinode and the node of the standing waves, meaning that the phase difference of the signal and control beams is 0° and 180‡°. The simulated results show that coherent perfect absorption can be realized at different frequencies and in particular each one can be switched on/off depending on the phase difference between the signal and control beams. In comparison with 35% absorption in the single-layer ASR metamaterial, the coherent perfect absorption occurs with larger than 95% absorption. In summary, we realize an ultra-thin subwavelength coherent absorber that holds much more flexibility operating at any frequency ranging from microwave to optical regimes. The response of metamaterials can be coherently tailored by easily changing their positions in the standing wave.

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